gengliangwang commented on a change in pull request #33176:
URL: https://github.com/apache/spark/pull/33176#discussion_r662426271



##########
File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
##########
@@ -2820,6 +2821,23 @@ object SQLConf {
       .booleanConf
       .createWithDefault(true)
 
+  object TimestampTypes extends Enumeration {
+    val TIMESTAMP_NTZ, TIMESTAMP_LTZ = Value
+  }
+
+  val TIMESTAMP_TYPE =
+    buildConf("spark.sql.timestampType")
+      .doc("Configures the default timestamp type of Spark SQL, including SQL 
DDL and Cast " +

Review comment:
       The scope is bigger than this. It will affect timestamp literal, 
function `to_timestamp` and data source io, etc. We will get to that later.




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